1995 Chevy Cheyenne No Start

My 95 Chevy 1500 started stalling while driving. The first time it shut down, I was able to start up again and drive about 10 feet before it shut off again. Over the course of about 5 minutes I had to restart it several times in order to park it. The only way I was able to keep it running was by gassing it up. Now it has no start. I have only had the pickup for a month but according to the previous owner the fuel filter and pump had been replaced recently. The gap in the spark plug is off but I am not getting any spark that I can tell by grounding the wires. Is there a better way to determine the failed part without trial and error as I am not able to afford many parts. Thanks